├── NSNull+JSON.h
└── NSNull+JSON.m


/NSNull+JSON.h:
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 1 | //
 2 | //  NSNull+JSON.h
 3 | //  JingZhenGu
 4 | //
 5 | //  Created by 杜维欣 on 15/10/30.
 6 | //  Copyright © 2015年 Mars. All rights reserved.
 7 | //
 8 | 
 9 | #import <Foundation/Foundation.h>
10 | 
11 | @interface NSNull (JSON)
12 | 
13 | @end
14 | 


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/NSNull+JSON.m:
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 1 | //
 2 | //  NSNull+JSON.m
 3 | //  JingZhenGu
 4 | //
 5 | //  Created by 杜维欣 on 15/10/30.
 6 | //  Copyright © 2015年 Mars. All rights reserved.
 7 | //
 8 | 
 9 | #import "NSNull+JSON.h"
10 | 
11 | @implementation NSNull (JSON)
12 | - (NSUInteger)length { return 0; }
13 | 
14 | - (NSInteger)integerValue { return 0; };
15 | 
16 | - (float)floatValue { return 0; };
17 | 
18 | - (NSString *)description { return @"0"; }
19 | 
20 | - (NSArray *)componentsSeparatedByString:(NSString *)separator { return @[]; }
21 | 
22 | - (id)objectForKey:(id)key { return nil; }
23 | 
24 | - (BOOL)boolValue { return NO; }
25 | 
26 | - (NSRange)rangeOfCharacterFromSet:(NSCharacterSet *)aSet{
27 |     NSRange nullRange = {NSNotFound, 0};
28 |     return nullRange;
29 | }
30 | 
31 | @end
32 | 


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